I am just curious.I know that some female birds will lay eggs,even if they have not been mated,and the eggs are not fertile. Is this true of conures as well?

*just wanted to add,I have no intentions of breeding birds-I just wanted to make sure Sweety is a boy and not a girl.(girls can have other medical problems with reproductive tracts-like getting egg bound and such,wich is why it would help to know)Sweety never laid eggs,so I am assuming boy,and I didnt want to stress him by having him 'sexed' as he is just a pet.If I can tell by weather he never laid eggs, that would save me some trouble of wondering his gender.

How would you go about finding out his gender? I know reptiles they 'probe' them,wich I refuse to do to Sweety.Can it be determined from a blood test?If so,the next bloodwork they do I will add the test on.If not,then I guess we shall never know!